Answer
$\frac{3\pi}{2}$ radians
Work Step by Step
To convert from degrees to radians, the measurement in degrees must be multiplied by $\frac{\pi}{180}$.
Therefore
$270°= 270° \times \frac{\pi}{180}$
$=\frac{270\pi}{180}$
$=\frac{27\pi}{18}$
$=\frac{3\pi}{2}$ radians